It is shown in Fig. REF  as a function of the reduced electric field, the latter being expressed in Td units: 1 Td = \(10^{-17}\)  V cm\(^2\) . It is possible to check the correctness of the distribution functions by comparing the calculated and measured electron drift velocities: this is done in Fig. REF  using the experimental data compiled in [1]}. It can be seen that the theoretical and experimental drift velocities are in a reasonable agreement, within a factor of 2, thus confirming the correctness of the calculated distribution functions for liquid Ar, Kr and Xe.
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